Soot-scraper.



No. 828,996. PATENTBD AUG. 21, 1906.

A. H. BLACKBURN.

569T SGRAPER.

APPLICATION FILED 11,111.25. 1905 wumtoz no: "III" I'IIIIII ca,mllwmcmn, n, c

ARTHUR H. BLACKBURN, OF MATTEAWA N, NEWV YORK.

SOOT-SORAPER.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed March 25, 1905. Serial No. 251.954.

To all whont it may concern.-

Be it known that I, ARTHUR H. BLACK- BURN, a subject of the King ofEngland, residing at Matteawan, in the county of Dutchess and State ofNew York, have invented certain new and useful Improvements inSoot-Scrapers, of which the following is a specification, referencebeing had to the drawings accompanying and forming part of the same.

My invention relates to reciprocating sootscrapers of the eneral typeshown in the patent to Edwar Green, No. 513,917, for dislodging sootfrom the ipes of fuel-economizers, air-heaters, and ot er ap aratus inwhich pipes are exposed to gases of combustion.

The object of my invention is to improve such scrapers, so that theywill produce a clean scrape and not leave portions of the pipe coveredwith soot, and also to prevent the soot dislodged from the pipe fromaccumulating between the pipe and the scraper, thereby lessening theeffectiveness of the latter.

To these ends the invention consists in the the novel features,arrangements of parts, and combinations of elements hereinafterdescribed, and more fully set forth in the claims.

Referring now to the drawings, which show convenient embodiments of theinvention, Figure 1 is a perspective view of one section of a scraper;and Fig. 2 is a perspective view of a section, showing a slightlydifferent construction.

Each scra' er-section consists, essentially, of upper an lower cutters 12, each being a segment of a ring joined by a connecting-bar 3. Eachcutter is concave on its inner side to provide 11 per and lower cuttingedges 4 5. The lower edge 5 is continued upward on the connecting-bar 3by a trian ular or pointed extension 6. The effect of t 's constructionis to throw the soot to either side instead of allowing it to accumulateon the edge 5 in the space between the bar 3 and the pipe upon which thescraper operates, as sometimes happens with scrapers in which thecutting edge lies wholly in one plane-that is, runs strai ht across theconnectin -bar. It can also e sharpened readily, as t e edges of thepointed extension can easily be reached by a grinding-tool, as a file oremery-wheel.

Fig. 2 shows the upper or lower half of a modified construction. In thiscase the pointed extension 7 extends farther up the connecting-bar 8,and to save weight and metal the center of the same is made open, asshown at 9.

Both forms are simple and cheap to manufacture, being easily made bycasting in the usual way. 1

What I claim is 1. In a soot-scraper, the combination of aconnecting-bar, a ring-segment at the end thereof arranged transverselthereto and having a scra ing edge provi ed with an ex tension of sustantially triangular form extending backward upon the connecting-bar,providing a continuous edge from the ends of the ring-segment to thepoint of the said extension, as set forth.

2. In a soot-scraper, the combination of a pair of ring-segments havingscraping edges, and a connecting-bar therefor, one of said ring-segmentshaving a substantially triangular extension of its cutting edge,extending upon, and toward the center of, the connecting-bar, providinga continuous ed e from the ends of the said ring-segment to t e point ofthe extension, as set forth.

ARTHUR H. BLACKBURN.

Witnesses IRVING E. ORMSBEE, HOWARD C. DUFF.

